drivers/gpu/drm/exynos/exynos_dp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Samsung SoC DP (Display Port) interface driver.
   4  *
   5  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
   6  * Author: Jingoo Han <jg1.han@samsung.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/component.h>
  11 #include <linux/err.h>
  12 #include <linux/module.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <video/of_display_timing.h>
  17 #include <video/of_videomode.h>
  18 #include <video/videomode.h>
  19
  20 #include <drm/bridge/analogix_dp.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_bridge.h>
  23 #include <drm/drm_crtc.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_panel.h>
  26 #include <drm/drm_print.h>
  27 #include <drm/drm_probe_helper.h>
  28 #include <drm/exynos_drm.h>
  29
  30 #include "exynos_drm_crtc.h"
  31
  32 #define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)
  33
  34 struct exynos_dp_device {
  35         struct drm_encoder         encoder;
  36         struct drm_connector       *connector;
  37         struct drm_bridge          *ptn_bridge;
  38         struct drm_device          *drm_dev;
  39         struct device              *dev;
  40
  41         struct videomode           vm;
  42         struct analogix_dp_device *adp;
  43         struct analogix_dp_plat_data plat_data;
  44 };
  45
  46 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
  47                                 bool enable)
  48 {
  49         struct exynos_dp_device *dp = to_dp(plat_data);
  50         struct drm_encoder *encoder = &dp->encoder;
  51
  52         if (!encoder->crtc)
  53                 return -EPERM;
  54
  55         exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
  56
  57         return 0;
  58 }
  59
  60 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
  61 {
  62         return exynos_dp_crtc_clock_enable(plat_data, true);
  63 }
  64
  65 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
  66 {
  67         return exynos_dp_crtc_clock_enable(plat_data, false);
  68 }
  69
  70 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
  71                                struct drm_connector *connector)
  72 {
  73         struct exynos_dp_device *dp = to_dp(plat_data);
  74         struct drm_display_mode *mode;
  75         int num_modes = 0;
  76
  77         if (dp->plat_data.panel)
  78                 return num_modes;
  79
  80         mode = drm_mode_create(connector->dev);
  81         if (!mode) {
  82                 DRM_DEV_ERROR(dp->dev,
  83                               "failed to create a new display mode.\n");
  84                 return num_modes;
  85         }
  86
  87         drm_display_mode_from_videomode(&dp->vm, mode);
  88         connector->display_info.width_mm = mode->width_mm;
  89         connector->display_info.height_mm = mode->height_mm;
  90
  91         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  92         drm_mode_set_name(mode);
  93         drm_mode_probed_add(connector, mode);
  94
  95         return num_modes + 1;
  96 }
  97
  98 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
  99                                    struct drm_bridge *bridge,
 100                                    struct drm_connector *connector)
 101 {
 102         struct exynos_dp_device *dp = to_dp(plat_data);
 103         int ret;
 104
 105         dp->connector = connector;
 106
 107         /* Pre-empt DP connector creation if there's a bridge */
 108         if (dp->ptn_bridge) {
 109                 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge);
 110                 if (ret) {
 111                         DRM_DEV_ERROR(dp->dev,
 112                                       "Failed to attach bridge to drm\n");
 113                         return ret;
 114                 }
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 121                                struct drm_display_mode *mode,
 122                                struct drm_display_mode *adjusted_mode)
 123 {
 124 }
 125
 126 static void exynos_dp_nop(struct drm_encoder *encoder)
 127 {
 128         /* do nothing */
 129 }
 130
 131 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 132         .mode_set = exynos_dp_mode_set,
 133         .enable = exynos_dp_nop,
 134         .disable = exynos_dp_nop,
 135 };
 136
 137 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
 138         .destroy = drm_encoder_cleanup,
 139 };
 140
 141 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 142 {
 143         int ret;
 144
 145         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 146         if (ret) {
 147                 DRM_DEV_ERROR(dp->dev,
 148                               "failed: of_get_videomode() : %d\n", ret);
 149                 return ret;
 150         }
 151         return 0;
 152 }
 153
 154 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 155 {
 156         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 157         struct drm_encoder *encoder = &dp->encoder;
 158         struct drm_device *drm_dev = data;
 159         int ret;
 160
 161         dp->dev = dev;
 162         dp->drm_dev = drm_dev;
 163
 164         dp->plat_data.dev_type = EXYNOS_DP;
 165         dp->plat_data.power_on_start = exynos_dp_poweron;
 166         dp->plat_data.power_off = exynos_dp_poweroff;
 167         dp->plat_data.attach = exynos_dp_bridge_attach;
 168         dp->plat_data.get_modes = exynos_dp_get_modes;
 169
 170         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 171                 ret = exynos_dp_dt_parse_panel(dp);
 172                 if (ret)
 173                         return ret;
 174         }
 175
 176         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 177                          DRM_MODE_ENCODER_TMDS, NULL);
 178
 179         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 180
 181         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 182         if (ret < 0)
 183                 return ret;
 184
 185         dp->plat_data.encoder = encoder;
 186
 187         dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 188         if (IS_ERR(dp->adp)) {
 189                 dp->encoder.funcs->destroy(&dp->encoder);
 190                 return PTR_ERR(dp->adp);
 191         }
 192
 193         return 0;
 194 }
 195
 196 static void exynos_dp_unbind(struct device *dev, struct device *master,
 197                              void *data)
 198 {
 199         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 200
 201         analogix_dp_unbind(dp->adp);
 202         dp->encoder.funcs->destroy(&dp->encoder);
 203 }
 204
 205 static const struct component_ops exynos_dp_ops = {
 206         .bind   = exynos_dp_bind,
 207         .unbind = exynos_dp_unbind,
 208 };
 209
 210 static int exynos_dp_probe(struct platform_device *pdev)
 211 {
 212         struct device *dev = &pdev->dev;
 213         struct device_node *np;
 214         struct exynos_dp_device *dp;
 215         struct drm_panel *panel;
 216         struct drm_bridge *bridge;
 217         int ret;
 218
 219         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 220                           GFP_KERNEL);
 221         if (!dp)
 222                 return -ENOMEM;
 223
 224         /*
 225          * We just use the drvdata until driver run into component
 226          * add function, and then we would set drvdata to null, so
 227          * that analogix dp driver would take charge of the drvdata.
 228          */
 229         platform_set_drvdata(pdev, dp);
 230
 231         /* This is for the backward compatibility. */
 232         np = of_parse_phandle(dev->of_node, "panel", 0);
 233         if (np) {
 234                 dp->plat_data.panel = of_drm_find_panel(np);
 235
 236                 of_node_put(np);
 237                 if (IS_ERR(dp->plat_data.panel))
 238                         return PTR_ERR(dp->plat_data.panel);
 239
 240                 goto out;
 241         }
 242
 243         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 244         if (ret)
 245                 return ret;
 246
 247         /* The remote port can be either a panel or a bridge */
 248         dp->plat_data.panel = panel;
 249         dp->plat_data.skip_connector = !!bridge;
 250         dp->ptn_bridge = bridge;
 251
 252 out:
 253         return component_add(&pdev->dev, &exynos_dp_ops);
 254 }
 255
 256 static int exynos_dp_remove(struct platform_device *pdev)
 257 {
 258         component_del(&pdev->dev, &exynos_dp_ops);
 259
 260         return 0;
 261 }
 262
 263 #ifdef CONFIG_PM
 264 static int exynos_dp_suspend(struct device *dev)
 265 {
 266         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 267
 268         return analogix_dp_suspend(dp->adp);
 269 }
 270
 271 static int exynos_dp_resume(struct device *dev)
 272 {
 273         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 274
 275         return analogix_dp_resume(dp->adp);
 276 }
 277 #endif
 278
 279 static const struct dev_pm_ops exynos_dp_pm_ops = {
 280         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 281         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 282                                 pm_runtime_force_resume)
 283 };
 284
 285 static const struct of_device_id exynos_dp_match[] = {
 286         { .compatible = "samsung,exynos5-dp" },
 287         {},
 288 };
 289 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 290
 291 struct platform_driver dp_driver = {
 292         .probe          = exynos_dp_probe,
 293         .remove         = exynos_dp_remove,
 294         .driver         = {
 295                 .name   = "exynos-dp",
 296                 .owner  = THIS_MODULE,
 297                 .pm     = &exynos_dp_pm_ops,
 298                 .of_match_table = exynos_dp_match,
 299         },
 300 };
 301
 302 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 303 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 304 MODULE_LICENSE("GPL v2");